New submission from Xiang Zhang: __contains__ operation in ItemsView, ValuesView and Sequence in collections.abc simply test equality with ==. This introduces inconsistent behaviour with built-in containers when encountering objects like NaN, which does not equal to itself. I asked something about this on core-mentorship, see https://mail.python.org/mailman/private/core-mentorship/2016-April/003543.html.
---------- components: Library (Lib) messages: 264688 nosy: xiang.zhang priority: normal severity: normal status: open title: Test identity first in membership operation of ItemsView, ValuesView and Sequence in collections.abc versions: Python 3.6 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue26915> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
